CN112507502A - Optimization method and device for 48V start-stop motor bracket of light-mixing engine - Google Patents
Optimization method and device for 48V start-stop motor bracket of light-mixing engine Download PDFInfo
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Abstract
The invention provides an optimization method and device for a 48V start-stop motor bracket of a light-mixing engine, wherein the method comprises the following steps: acquiring an initial starting and stopping motor support model with a first-order modal frequency meeting a preset condition; performing two times of topology optimization on the initial starting and stopping motor support model; processing a topology optimization result by utilizing a preset manufacturing constraint rule and combining a bionic structure form to obtain a starting and stopping motor support model; and optimizing the local stress and fatigue of the starting and stopping motor support model. The start-stop motor support model constructed by the invention has the advantages of light weight and biochemistry simulation, greatly reduces the material consumption and weight of the start-stop motor support on the premise of meeting the modal frequency requirement and the fatigue strength requirement, and improves the economy of the start-stop motor support.
Description
Technical Field
The invention relates to the technical field of design of cast aluminum alloy mounting brackets of start-stop motors, in particular to an optimization method and device of a 48V start-stop motor bracket of a light-mixing engine.
Background
With the stricter and stricter national automobile emission regulations and the continuous deepening of the electrification development of engine technologies, the 48V start-stop micro-hybrid technology has more and more cost performance on energy conservation and emission reduction. However, the 48V start-stop motor is larger in size, heavier in weight and inconvenient to directly fix on an engine compared with a traditional motor, so that a 48V start-stop motor support is generally adopted in engineering to support the installation of the 48V start-stop motor.
At the present stage, the start-stop motor support model is designed by adopting a manual experience method, but experience is inevitable to cause a plurality of defects, such as heavy structure, poor structural rigidity, low modal frequency and the like.
Disclosure of Invention
In order to solve the problems, the invention provides an optimization method and a device for a 48V start-stop motor bracket of a light-mixing engine, and the technical scheme is as follows:
a method for optimizing a 48V start-stop motor support of a light-mixing engine comprises the following steps:
acquiring an initial starting and stopping motor support model with a first-order modal frequency meeting a preset condition;
performing topology optimization twice on the initial starting and stopping motor support model;
processing a topology optimization result by utilizing a preset manufacturing constraint rule and combining a bionic structure form to obtain a starting and stopping motor support model;
optimizing local stress and fatigue of the starting and stopping motor support model;
wherein, to the initial start-stop motor support model carry out topology optimization twice, include:
determining a spatial region for topology optimization;
performing topology optimization in the space region by taking the modal frequency reaching a preset modal frequency as constraint and taking the region volume minimum as an optimization target to obtain a minimum volume parameter;
carrying out amplification processing on the minimum volume parameter, and carrying out topology optimization by taking the minimum volume parameter after amplification processing as constraint and taking modal frequency maximization as an optimization target to obtain a force transmission path of the space region and a relative density parameter of the material, wherein the relative density parameter of the material is used for representing the importance degree of the material on the modal frequency;
and carrying out material processing on the initial start-stop motor bracket model based on the force transmission path and the relative density parameter of the material.
Preferably, the acquiring of the initial start-stop motor support model with the first-order modal frequency meeting the preset condition includes:
generating an original starting and stopping motor support model according to preset configuration parameters, and determining the original starting and stopping motor support model as a current support model;
calculating the first order modal frequency of the current support model;
judging whether the first-order modal frequency of the current support model is within a preset modal frequency allowable range;
if so, determining the current support model as an initial start-stop motor support model;
and if not, performing material space increasing processing on the current support model, and returning to execute the step of calculating the first-order modal frequency of the current support model.
Preferably, the method further comprises:
and outputting a characteristic table, wherein the characteristic table records the area identification of the space area and the relative density parameter of the material.
An optimization device for a 48V start-stop motor support of a light-mixing engine comprises:
the acquisition module is used for acquiring an initial start-stop motor support model with the first-order modal frequency meeting a preset condition;
the topology optimization module is used for carrying out twice topology optimization on the initial starting and stopping motor support model;
the processing module is used for processing a topology optimization result by utilizing a preset manufacturing constraint rule and combining a bionic structure form to obtain a starting and stopping motor support model;
the local optimization module is used for optimizing local stress and fatigue of the starting and stopping motor support model;
the topology optimization module is specifically configured to:
determining a spatial region for topology optimization; performing topology optimization in the space region by taking the modal frequency reaching a preset modal frequency as constraint and taking the region volume minimum as an optimization target to obtain a minimum volume parameter; carrying out amplification processing on the minimum volume parameter, and carrying out topology optimization by taking the minimum volume parameter after amplification processing as constraint and taking modal frequency maximization as an optimization target to obtain a force transmission path of the space region and a relative density parameter of the material, wherein the relative density parameter of the material is used for representing the importance degree of the material on the modal frequency; and carrying out material processing on the initial start-stop motor bracket model based on the force transmission path and the relative density parameter of the material.
Preferably, the obtaining module is specifically configured to:
generating an original starting and stopping motor support model according to preset configuration parameters, and determining the original starting and stopping motor support model as a current support model; calculating the first order modal frequency of the current support model; judging whether the first-order modal frequency of the current support model is within a preset modal frequency allowable range; if so, determining the current support model as an initial start-stop motor support model; and if not, performing material space increasing processing on the current support model, and returning to execute the step of calculating the first-order modal frequency of the current support model.
Preferably, the topology optimization module is further configured to:
and outputting a characteristic table, wherein the characteristic table records the area identification of the space area and the relative density parameter of the material.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an optimization method and device for a 48V start-stop motor support of a light-mixing engine, wherein the light weight of an initial start-stop motor support model is realized by carrying out topology optimization on the initial start-stop motor support model with the first-order modal frequency meeting the preset conditions; and processing the topology optimization result by using a preset manufacturing constraint rule, so that the obtained starting and stopping motor support model conforms to the manufacturing constraint. Therefore, the start-stop motor support model constructed by the invention has the advantages of light weight and biochemistry simulation, greatly reduces the material consumption and weight of the start-stop motor support on the premise of meeting the modal frequency requirement and the fatigue strength requirement, and improves the economy of the start-stop motor support.
In addition, the start-stop motor support produced based on the start-stop motor support model, especially the separated start-stop motor support, has strong practicability, universality, high efficiency and light weight, and has wide application prospect.
In addition, the starting and stopping motor support model constructed by the invention can be widely applied to the design and optimization of various supports such as a mounting support of a starting and stopping motor, an engine suspension support and the like.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for optimizing a 48V start-stop motor support of a mild hybrid engine according to an embodiment of the present invention;
FIG. 2 is a front view of a start-stop motor support model in a maximum material space;
FIG. 3 is a back view of a model of a start-stop motor bracket in a maximum material space;
FIG. 4 is a partial method flowchart of a method for optimizing a 48V start-stop motor support of a mild hybrid engine according to an embodiment of the present invention;
FIG. 5 is a flowchart of another part of a method for optimizing a 48V start-stop motor support of a mild hybrid engine according to an embodiment of the present invention;
FIG. 6 is an example of a start stop motor bracket model;
FIG. 7 is another example of a start stop motor bracket model;
fig. 8 is a schematic structural diagram of an optimization device of a 48V start-stop motor support of a mild mixing engine according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first order modal frequencies are commonly used to evaluate structural stiffness and stability parameters. Under the condition that the external excitation frequency and the first-order modal frequency of the structure do not resonate, the higher the first-order modal frequency value is, the stiffer and more stable the structure is, and the structure is less prone to damage.
The embodiment of the invention provides an optimization method of a 48V start-stop motor support of a mild hybrid engine, and a flow chart of the method is shown in figure 1, and the method comprises the following steps:
and S10, acquiring an initial start-stop motor support model with the first-order modal frequency meeting a preset condition.
In this embodiment, the support material, the spatial interference between the support and the surrounding parts, the installation gap of the support, and the like may be considered, and the start-stop motor support model in the maximum material space is used as the initial start-stop motor support model. The design of the maximum material space is used most, and is the heaviest, and the modal characteristics can generally meet the design requirements of starting and stopping the motor support. Fig. 2 is a front view of a start-stop motor support model in a maximum material space, and fig. 3 is a back view of the start-stop motor support model in the maximum material space.
In a specific implementation process, the step S10 of "obtaining an initial start-stop motor support model with a first-order modal frequency meeting a preset condition" may specifically adopt the following steps, and a flowchart of the method is shown in fig. 4:
s101, generating an original starting and stopping motor support model according to preset configuration parameters, and determining the original starting and stopping motor support model as a current support model.
And S102, calculating the first-order mode frequency of the current stent model.
In this embodiment, the existing modal calculation method, for example, a finite element calculation method is adopted to disperse the whole model into a finite number of units (the units are composed of nodes), a matrix node displacement equation is solved through a matrix theory, the eigenvalue of the equation is the modal frequency, the eigenvector is the modal shape, and the equation solution process is the modal analysis process.
S103, judging whether the first-order modal frequency of the current support model is within a preset modal frequency allowable range; if yes, go to step S104; if not, go to step S105.
And S104, determining the current support model as an initial start-stop motor support model.
And S105, performing material space increasing processing on the current bracket model, and returning to execute the step S102.
In the process of executing step S105, the material space theoretically refers to a space remaining in the total layout space of the engine after removing relevant parts such as the start-stop motor, the engine cylinder block, the engine cylinder head and the like and installation gaps thereof.
And S20, performing two times of topology optimization on the initial start-stop motor support model.
In this embodiment, the process of initially starting and stopping the topological optimization of the motor support model includes removing a material region that does not contribute to the improvement of the modal frequency of the support and reserving a material region that contributes to the improvement of the modal frequency.
In a specific implementation process, the step S20 "perform topology optimization twice on the initial start-stop motor support model" may specifically adopt the following steps, and a flowchart of the method is shown in fig. 5:
s201, determining a space area for topology optimization.
In this embodiment, the spatial region for topology optimization is predefined, and may be part or all of the initial start-stop motor support model.
S202, carrying out topological optimization in the space region by taking the modal frequency reaching the preset modal frequency as constraint and taking the region volume minimum as an optimization target to obtain a minimum volume parameter.
In this embodiment, the minimum volume parameter is a minimum region volume satisfying a preset modal frequency in the spatial region.
S203, amplifying the minimum volume parameter, and performing topology optimization by using the minimum volume parameter after amplification as constraint and using modal frequency maximization as an optimization target to obtain a force transmission path of a space region and a relative density parameter of the material, wherein the relative density parameter of the material is used for representing the importance degree of the material on modal frequency.
Under the current technical system, the algorithm adopted in the topology optimization of step S202 is a unit variable density method, and therefore the obtained minimum region volume contains a large number of intermediate density units, and therefore the minimum volume parameter needs to be amplified.
In the process of executing step S203, to achieve topology optimization in a relatively large space, the minimum volume parameter may be amplified by a specified amplification factor, such as 15%. Of course, in this process, the manufacturing constraint and the thickness of the structural steel bar may be used as auxiliary constraints at the same time, which is not limited in this embodiment.
And S204, carrying out material processing on the initial start-stop motor support model based on the force transmission path and the relative density parameter of the material.
In the process of executing step S204, the material not in the transmission path of the structural force is removed, and further, the material in the transmission path of the structural force is removed, and the material having the relative density parameter smaller than the specified threshold value is removed.
In some other embodiments, to prompt the engineer about the importance of the material to the modal frequency, step S20 may further include the following steps:
and outputting a characteristic table, wherein the characteristic table records the area identifier of the space area and the relative density parameter of the material, wherein the area identifier of the space area can be the area name of the space area, and can also be the area number and the like.
Of course, the topology optimization result can be graphically displayed for vividly displaying the output characteristic table. For example, different colors may be used to fill the spatial region, thereby indicating the relative density parameter of the material in the spatial region. For example, the redder the color, the larger the relative density parameter of the material, the more desirable it is to retain.
And S30, processing the topology optimization result by utilizing a preset manufacturing constraint rule and combining the bionic structure form to obtain a start-stop motor support model.
In the process of executing step S30, the topology optimization result is processed in accordance with the manufacturing process constraint of the part and the like. In addition, the force transmission path in the biological world is labor-saving and economical, and the topological optimization result is processed by combining the bionic morphology of animals and plants. Fig. 6 is an example of a start-stop motor support model, and fig. 7 is another example of a start-stop motor support model.
And S40, optimizing stress and fatigue of the start-stop motor support model.
In order to enable the start-stop motor support model to meet other testing requirements, in the process of executing the step S40, local strength and fatigue checking and optimizing can be carried out on the start-stop motor support model based on an analysis method of Abaqus Fe-safe Tosca multidisciplinary joint simulation morphology optimization until the whole model meets the stress and fatigue design requirements.
The above steps S101 to S105 are only a preferred implementation manner of the process of "obtaining the initial start-stop motor support model with the first-order modal frequency meeting the preset condition" in step S10 disclosed in the embodiment of the present invention, and the specific implementation manner of this process may be arbitrarily set according to the own requirements, and is not limited herein.
The above steps S201 to S204 are only a preferred implementation manner of the process of "performing topology optimization twice on the initial start-stop motor support model" in step S20 disclosed in the embodiment of the present invention, and the specific implementation manner of this process may be arbitrarily set according to the own requirements, and is not limited herein.
According to the method for constructing the starting and stopping motor support model, the initial starting and stopping motor support model with the first-order modal frequency meeting the preset conditions is subjected to topological optimization, so that the initial starting and stopping motor support model is lightened; and processing the topology optimization result by using a preset manufacturing constraint rule, so that the obtained starting and stopping motor support model conforms to the manufacturing constraint. Therefore, the start-stop motor support model constructed by the invention has the advantages of light weight and biochemistry simulation, greatly reduces the material consumption and weight of the start-stop motor support on the premise of meeting the modal frequency requirement and the fatigue strength requirement, and improves the economy of the start-stop motor support.
Based on the method for constructing the start-stop motor support model provided in the above embodiment, an embodiment of the present invention correspondingly provides a device for executing the method for constructing the start-stop motor support model, and a schematic structural diagram of the device is shown in fig. 8, and the method includes:
the acquisition module 10 is used for acquiring an initial start-stop motor support model with a first-order modal frequency meeting a preset condition;
the topology optimization module 20 is configured to perform two times of topology optimization on the initial start-stop motor support model;
the processing module 30 is configured to process the topology optimization result by using a preset manufacturing constraint rule and combining a bionic structure form to obtain a start-stop motor support model;
and the local optimization module 40 is used for optimizing the local stress and fatigue of the start-stop motor support model.
In some other embodiments, the obtaining module 10 is specifically configured to:
generating an original starting and stopping motor support model according to preset configuration parameters, and determining the original starting and stopping motor support model as a current support model; calculating the first order modal frequency of the current stent model; judging whether the first-order modal frequency of the current support model is within a preset modal frequency allowable range; if so, determining the current support model as an initial starting and stopping motor support model; and if not, performing material space increasing processing on the current support model, and returning to execute the step of calculating the first-order modal frequency of the current support model.
In some other embodiments, the topology optimization module 20 is specifically configured to:
determining a spatial region for topology optimization; performing topological optimization in a space region by taking the modal frequency reaching a preset modal frequency as constraint and taking the region volume minimum as an optimization target to obtain a minimum volume parameter; amplifying the minimum volume parameter, and performing topology optimization by taking the minimum volume parameter after amplification as constraint and modal frequency maximization as an optimization target to obtain a force transmission path of a space region and a relative density parameter of the material, wherein the relative density parameter of the material is used for representing the importance degree of the material on modal frequency; and carrying out material processing on the initial start-stop motor support model based on the force transmission path and the relative density parameter of the material.
In some other embodiments, the topology optimization module 20 is further configured to:
and outputting a characteristic table, wherein the characteristic table records the area identification of the space area and the relative density parameter of the material.
According to the optimization device for the 48V start-stop motor support of the light-mixing engine, provided by the embodiment of the invention, the initial start-stop motor support model with the first-order modal frequency meeting the preset condition is subjected to topological optimization, so that the light weight of the initial start-stop motor support model is realized; and processing the topology optimization result by using a preset manufacturing constraint rule, so that the obtained starting and stopping motor support model conforms to the manufacturing constraint. Therefore, the start-stop motor support model constructed by the invention has the advantages of light weight and biochemistry simulation, greatly reduces the material consumption and weight of the start-stop motor support on the premise of meeting the modal frequency requirement and the fatigue strength requirement, and improves the economy of the start-stop motor support.
The method and the device for optimizing the 48V start-stop motor support of the mild mixing engine provided by the invention are described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include or include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The optimization method of the 48V start-stop motor support of the light-mixing engine is characterized by comprising the following steps of:
acquiring an initial starting and stopping motor support model with a first-order modal frequency meeting a preset condition;
performing topology optimization twice on the initial starting and stopping motor support model;
processing a topology optimization result by utilizing a preset manufacturing constraint rule and combining a bionic structure form to obtain a starting and stopping motor support model;
optimizing local stress and fatigue of the starting and stopping motor support model;
wherein, to the initial start-stop motor support model carry out topology optimization twice, include:
determining a spatial region for topology optimization;
performing topology optimization in the space region by taking the modal frequency reaching a preset modal frequency as constraint and taking the region volume minimum as an optimization target to obtain a minimum volume parameter;
carrying out amplification processing on the minimum volume parameter, and carrying out topology optimization by taking the minimum volume parameter after amplification processing as constraint and taking modal frequency maximization as an optimization target to obtain a force transmission path of the space region and a relative density parameter of the material, wherein the relative density parameter of the material is used for representing the importance degree of the material on the modal frequency;
and carrying out material processing on the initial start-stop motor bracket model based on the force transmission path and the relative density parameter of the material.
2. The method of claim 1, wherein the obtaining of the initial start-stop motor support model with the first-order modal frequency meeting the preset condition comprises:
generating an original starting and stopping motor support model according to preset configuration parameters, and determining the original starting and stopping motor support model as a current support model;
calculating the first order modal frequency of the current support model;
judging whether the first-order modal frequency of the current support model is within a preset modal frequency allowable range;
if so, determining the current support model as an initial start-stop motor support model;
and if not, performing material space increasing processing on the current support model, and returning to execute the step of calculating the first-order modal frequency of the current support model.
3. The method of claim 1, further comprising:
and outputting a characteristic table, wherein the characteristic table records the area identification of the space area and the relative density parameter of the material.
4. The utility model provides a gently mix engine 48V and open optimization device who stops motor support which characterized in that includes:
the acquisition module is used for acquiring an initial start-stop motor support model with the first-order modal frequency meeting a preset condition;
the topology optimization module is used for carrying out twice topology optimization on the initial starting and stopping motor support model;
the processing module is used for processing a topology optimization result by utilizing a preset manufacturing constraint rule and combining a bionic structure form to obtain a starting and stopping motor support model;
the local optimization module is used for optimizing local stress and fatigue of the starting and stopping motor support model;
the topology optimization module is specifically configured to:
determining a spatial region for topology optimization; performing topology optimization in the space region by taking the modal frequency reaching a preset modal frequency as constraint and taking the region volume minimum as an optimization target to obtain a minimum volume parameter; carrying out amplification processing on the minimum volume parameter, and carrying out topology optimization by taking the minimum volume parameter after amplification processing as constraint and taking modal frequency maximization as an optimization target to obtain a force transmission path of the space region and a relative density parameter of the material, wherein the relative density parameter of the material is used for representing the importance degree of the material on the modal frequency; and carrying out material processing on the initial start-stop motor bracket model based on the force transmission path and the relative density parameter of the material.
5. The apparatus of claim 4, wherein the obtaining module is specifically configured to:
generating an original starting and stopping motor support model according to preset configuration parameters, and determining the original starting and stopping motor support model as a current support model; calculating the first order modal frequency of the current support model; judging whether the first-order modal frequency of the current support model is within a preset modal frequency allowable range; if so, determining the current support model as an initial start-stop motor support model; and if not, performing material space increasing processing on the current support model, and returning to execute the step of calculating the first-order modal frequency of the current support model.
6. The apparatus of claim 4, wherein the topology optimization module is further configured to:
and outputting a characteristic table, wherein the characteristic table records the area identification of the space area and the relative density parameter of the material.
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